Integrate LLVM at llvm/llvm-project@347d4d7323c4
Integrate LLVM at llvm/llvm-project@347d4d7323c4

Updates LLVM usage to match
[347d4d7323c4](https://github.com/llvm/llvm-project/commit/347d4d7323c4)

PiperOrigin-RevId: 422671509

google-research/structured-additive-IR,google-research/structured-additive-IR